It is 4.
The hundredth column of 3.919 is 1
784962.3715
232.88
the hundredth column is second place after decimal; in this case 4
3.63
0.79
There are 0.3048 metres in one foot. Therefore, 3646 feet is equal to 3646 x 0.3048 = 1111.3008 metres.
127816.95
0.0002
18.99
other
the 5 is already in the hundredths column so you cannot round off; you would need to see the thousandths column